JP5284913B2 - ENGINE CONTROL DEVICE, VEHICLE, AND ENGINE CONTROL METHOD - Google Patents

Description

  The present invention relates to a technique for controlling start of a vehicle engine.

  A vehicle that travels using an engine as a power source includes an engine control device that controls the start of the engine.

  The engine control device controls cranking of the engine by controlling a starter system that drives a starter motor when a starter switch is operated by a user.

  First, when the starter switch is operated by the user and the start switch is turned on, the starter motor controls the drive lever of the plunger to the output shaft of the starter motor that is in the non-engagement state. This is performed by bringing the pinion gear provided and the ring gear provided on the output shaft of the engine into mesh, and controlling the rotation of the starter motor.

  Control of the drive lever is executed by turning on the start switch by the user operating the starter switch, causing electricity from the battery included in the vehicle to flow through the coil, and generating magnetism in the electromagnet that opposes the coil. Thereby, the electromagnet with magnetism can move the drive lever in the opposite direction to the starter motor in the output shaft direction of the starter motor by its action.

  The pinion gear provided on the output shaft of the starter motor is connected to the drive lever. When the drive lever is controlled, the pinion gear moves in the opposite direction of the starter motor in the direction of the output shaft of the starter motor, and is positioned in the opposite direction of the starter motor. Meshes with the ring gear on the output shaft of the engine.

  An abnormal noise is generated when each gear is engaged, but this abnormal noise tends to decrease when the teeth of each gear are smoothly incorporated into the valley of each gear, and smoothly into the valley of each gear. In the case where the gear teeth are contacted without being engaged, the gears tend to become large. In order to suppress the occurrence of the abnormal noise, it is necessary to engage with each other in a state where the teeth of each gear smoothly enter the trough of each gear, that is, in a state where each gear is stopped.

  For example, Patent Document 1 discloses a technique for suppressing the occurrence of abnormal noise by driving a starter motor after each gear is engaged. In other words, since the starter motor is driven and controlled after a period of time during which each gear is engaged after electricity is passed through the coil, each gear can be brought into engagement at a timing when each gear is not rotating. Sound generation can be reduced.

  Such control is not realized by software control including a calculation unit such as a CPU, but by hardware control such as a logic circuit that does not include a calculation unit such as a CPU having a lower failure rate than the software control. It is better to realize. The reason is that an engine start failure is one of the most detrimental commodities compared to other functional failures, so that such a failure should be prevented from occurring as much as possible.

  On the other hand, engine start control includes engine start control by an idling stop function. The engine start control by the idling stop function means that the start switch is turned on by a user operation of the starter switch and the engine is started until the engine is stopped by the user turning off the ignition switch. This is engine start control that stops the engine when conditions such as detection of a stop are satisfied, and starts the engine when conditions such as detection of a user's accelerator operation are detected thereafter.

  The engine start control by the idling stop function basically stops the engine when the vehicle stops temporarily, and starts the engine when the vehicle departs thereafter. Therefore, the start control tends to be frequently repeated.

  Engine start control by such an idling stop function needs to improve the convenience of the user by speeding up the start of the engine. However, if the ambient temperature of the coil or electromagnet that operates the drive lever of the starter system is low Since the lower the magnet, the less magnetism that causes the electromagnet to actuate the drive lever is less likely to occur, so that the time (delay time) when driving the starter motor after passing the time that each gear is engaged by applying electricity to the coil ) Must be made longer when the ambient temperature of the coil or electromagnet is low than when the ambient temperature is high.

  If this control is implemented by hardware control, the delay time cannot be changed as appropriate according to the ambient temperature of the coil or electromagnet, so the time that guarantees the minimum operating time of the plunger, that is, when the temperature is low The starter system must be controlled based on the delay time when the temperature is low, even though the delay time can be shorter when the temperature is high than when the temperature is low. The engine startability cannot be improved.

  Therefore, the engine start control by the idling stop function sets the delay time according to the detected ambient temperature of the coil and the electromagnet, and prevents the generation of the noise while improving the startability of the engine when the temperature is high. At the same time, it is more appropriate to realize the control by software control that can ensure that the engine starts when the temperature is low.

  Therefore, when the start switch is turned on by the user operating the starter switch and the engine is controlled to start, the engine is started based on hardware control. When the engine is controlled to start using the idling stop function, the engine is controlled based on software control. It is conceivable to adopt a configuration for starting the system.

JP 2004-11627 A

  However, as described above, there is a possibility that a failure may occur even if the engine start control is performed by the hardware control unit having a low failure rate. There is also a possibility that a failure may occur in the engine start control by the software control unit.

  The present invention has been made in view of the above problems, and an object thereof is to provide an engine start control technique capable of starting an engine when a failure occurs in a hardware control unit or a software control unit.

  In order to solve the above-mentioned problems, the invention of claim 1 is directed to start the engine of a vehicle by introducing a current from a power source to a starter motor and a coil that changes a connection state of the output shaft of the starter motor to the engine. An engine control device for controlling, comprising: a second current system that branches from a first current system that conducts current from the power source to the coil and that conducts current to the starter motor; A first switch for energizing or interrupting a current led from one current system to a starter motor; a delay circuit for controlling the first switch and delaying the current after being led to the coil to lead the current to the starter motor; A third current system for guiding current from the power source to the coil is energized to conduct the current from the power source to the coil by turning on or off. A second switch that cuts off, and a third switch that is interposed in a fourth current system that leads current from the power source to the starter motor, and that turns on or off the current from the power source to the starter motor; A control means for controlling the second switch and the third switch to execute engine start control; and a first detection for detecting a voltage on the power source side from a first switch interposed in the second current system. And a second detection means for detecting a voltage on the starter motor side from a first switch interposed in the second current system, and the control means is interposed in the first current system by a user operation. When the start switch to be mounted is turned on, the first switch is turned off based on the voltage detected by the first detector and the voltage detected by the second detector When detecting, the starting control of the engine by controlling the third switch.

  The invention according to claim 2 is the engine control device according to claim 1, further comprising temperature detection means for detecting the temperature of the coil, and the control means turns on the second switch to supply current to the coil. After a time corresponding to the temperature has elapsed since the current is supplied, the third switch is turned on to pass a current to the starter motor.

  The invention according to claim 3 is the engine control device according to claim 1 or 2, wherein the control means detects the first detection when the start switch is turned on by a user operation. When the voltage difference between the voltage detected by the means and the voltage detected by the second detection means is greater than or equal to a predetermined value, the first switch is instructed to turn on, and the voltage difference at that time is greater than or equal to the predetermined value Controls the second switch and the third switch to start the engine.

  According to a fourth aspect of the present invention, in the engine control apparatus according to any one of the first to third aspects, the control means instructs the third switch to turn on, and the second detection is performed at that time. When the voltage detected by the means is equal to or lower than a predetermined voltage, electricity from the third current system is guided to the second current system by turning on the first switch and the second switch.

  According to a fifth aspect of the present invention, in the engine control device according to the fourth aspect, when the start switch is turned on by a user operation, the delay circuit controls the first switch to supply current to the coil. When the second switch is turned on by the control means, the first switch is turned off to cut off the current led to the starter motor.

  The invention of claim 6 is a vehicle, which is an engine, a starter motor that starts the engine, a coil that changes a connection state of an output shaft of the starter motor to the engine, the starter motor, and the coil And an engine control device according to any one of claims 1 to 5, which controls starting of the engine by guiding a current from a power source.

  According to a seventh aspect of the present invention, there is provided an engine control method for controlling start of a vehicle engine by introducing current from a power source to a starter motor and a coil for changing a connection state of the output shaft of the starter motor to the engine. The vehicle is interposed in a second current system that branches from the first current system that leads from the power source to the coil and guides the current to the starter motor, and is turned on or off to turn on the first current system. A first switch for energizing or shutting off a current led to the starter motor, a delay circuit for controlling the first switch, delaying the current after being led to the coil and guiding the current to the starter motor, and the power source A third current system that guides current to the coil is energized or interrupted by turning on or off the current that is guided from the power source to the coil. A switch, a third switch interposed in a fourth current system for guiding current from the power source to the starter motor, and energizing or interrupting current from the power source to the starter motor by turning on or off; and the second switch Control means for controlling the switch and the third switch to execute engine start control; first detection means for detecting the voltage on the power source side from the first switch, which is interposed in the second current system; Second detection means for detecting a voltage on the starter motor side from a first switch interposed in the second current system, and the vehicle is installed in the first current system by a user operation. When the start switch is turned on and electricity flows to the second current system, the voltage is detected based on the voltage detected by the first detection means and the voltage detected by the second detection means. A step of detecting the off-fixation abnormality of the first switch, when detecting the off-fixation abnormality of the first switch comprises the step of starting control of the engine by controlling the third switch.

  According to an eighth aspect of the present invention, there is provided an engine control apparatus for controlling start of a vehicle engine by guiding current from a power source to a starter motor and a coil for changing a connection state of the output shaft of the starter motor to the engine. And when the intervening start switch is turned on or off, it is interposed in a second current system that branches from the first current system that guides current from the power source to the coil and guides current to the starter motor, A first switch for energizing or shutting off a current that is led from the first current system to the starter motor by turning on or off, and a starter motor that controls the first switch and delays after the current is led to the coil A delay circuit for guiding current to the coil, and a third current system for guiding current from the power source to the coil. And a second switch for energizing or interrupting the current led to the coil and a fourth current system for guiding the current from the power source to the starter motor. The current from the power source to the starter motor by turning on or off. The starter by means of a third switch for energizing or shutting off, a control means for controlling the second switch and the third switch to perform engine start control, and a third switch interposed in the second current system Detecting means for detecting a voltage on the motor side, and the control means instructs to turn on the third switch, and when the voltage detected by the detecting means at that time indicates a predetermined voltage or less, The first switch and the second switch are turned on.

  According to a ninth aspect of the present invention, there is provided an engine control apparatus for controlling start of a vehicle engine by introducing a current from a power source to a starter motor and a coil for changing a connection state of the output shaft of the starter motor to the engine. And a second current system that branches from the first current system that conducts current from the power source to the coil and that conducts current to the starter motor, and is turned on or off to start the starter from the first current system. A first switch for energizing or shutting off a current that leads to the motor; a delay circuit that controls the first switch to delay the current after being led to the coil and that leads the current to the starter motor; and from the power source to the coil A second switch that is connected to a third current system that conducts current to the coil, and that energizes or interrupts the current that is led from the power source to the coil by turning on or off. A third switch which is interposed in a fourth current system for guiding current from the power source to the starter motor, and which turns on or off the current from the power source to the starter motor, and the second switch Control means for controlling the switch and the third switch to execute engine start control, first detection means for detecting the voltage on the power source side from the first switch interposed in the second current system, And a second detection means for detecting a voltage on the starter motor side from a first switch interposed in the second current system, and the control means is a start provided in the first current system by a user operation. If the difference between the voltage detected by the first detection means and the voltage detected by the second detection means is greater than or equal to a predetermined value when the switch is turned on, the engine is controlled by controlling the third switch. To start control.

  According to the first to ninth aspects of the present invention, the control means controls the third switch when the start switch is turned on by a user operation and the starter motor cannot be driven because the first switch is stuck off abnormally. Then, since the starter motor is driven, engine starting failure can be avoided.

  In particular, according to the invention of claim 2, the time for conducting electricity to the starter motor after elapse of the time for connecting the output shaft of the starter motor to the engine is set according to the ambient temperature of the coil. In addition to improving the startability of the engine when the temperature is high, the engine can be reliably started when the temperature is low.

  According to the invention of claim 3 in particular, the off-fixing abnormality is estimated based on the voltage difference between the upstream and downstream of the first switch, and when the off-fixing abnormality is estimated, an instruction to turn on the first switch is issued. If the voltage difference still exists even if the operation is performed, the off-fixation abnormality is determined, so that the reliability of the off-fixation abnormality determination is improved, fail-safe control is reliably performed, and it is not performed wastefully.

  Further, according to the invention of claim 4 and claim 8 in particular, the control means gives an instruction to turn on the third switch, and when the third switch is off-fixed abnormally and the starter motor cannot be driven, Since the control means controls the first switch and the second switch to drive the starter motor, engine starting failure can be avoided.

  According to the invention of claim 5 in particular, when the start switch is turned on by a user operation and the first switch cannot be driven due to an abnormal fixing failure, the control means is connected to the second switch and the third switch. It is possible to prevent malfunction caused by the electricity generated when the starter motor is driven by controlling the switch around the delay circuit.

FIG. 1 is a diagram illustrating a starter system. FIG. 2 is a block diagram illustrating the engine control device. FIG. 3 is a block diagram illustrating the engine control device. FIG. 4 is a circuit diagram illustrating the engine control device and the starter system. FIG. 5 is a flowchart for explaining the engine control. FIG. 6 is a circuit diagram illustrating the engine control device and the starter system. FIG. 7 is a flowchart for explaining engine control.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

<Embodiment>
<First Embodiment>
<Vehicle configuration>
The vehicle according to the first embodiment includes an engine serving as a power source. The engine is started by a starter system and controlled by an engine control device. The starter system includes a starter motor, a plunger, a circuit that controls them, and electronic components.

<Starter system>
As shown in FIG. 1, the starter system includes a starter motor 5, a plunger 3, a coil 1 that controls them, an electromagnet 2, a circuit, and electronic components.

  The starter motor 5 is driven when the starter system controls the drive lever 4 of the plunger 3 when the starter switch 12 is operated by the user and the start switch 30 is turned on, so that the starter motor 5 is in the non-engagement state. The pinion gear 7 provided on the output shaft 6 and the ring gear 8 provided on the output shaft 9 of the engine are engaged with each other, and the starter motor 5 is rotationally controlled.

  As for the control of the drive lever 4, the start switch 30 is turned on by the operation of the starter switch 12 by the user, the electricity from the power supply unit provided in the vehicle is passed to the coil 1, and magnetism is generated in the electromagnet 2 opposed to the coil 1. To execute. Thereby, the magnetized electromagnet can move the drive lever 4 in the direction opposite to the starter motor 5 in the output shaft direction of the starter motor 5 by its action.

  The pinion gear 7 provided on the output shaft 6 of the starter motor 5 is connected to the drive lever 4 and is moved in the opposite direction to the starter motor 5 in the output shaft direction of the starter motor 5 by controlling the drive lever 4. It meshes with a ring gear 8 provided on the output shaft 9 of the engine located in the opposite direction of the starter motor 5.

<Engine control device>
The engine control device includes an electronic component such as a CPU, and calculates a control value for controlling an actuator such as a spark plug, an injector, or a throttle based on an input value from a sensor that detects the state of the vehicle. The engine is controlled by outputting the control value to the actuator.

<System block diagram>
A block diagram of the engine control device will be described with reference to FIG.

  An idling stop-ECU 100 Electronic Control Unit) includes a calculation unit 100a (for example, a CPU), a non-volatile storage unit 100b (for example, a ROM) in which a control program and the like are stored, and a volatile storage unit 100c that serves as a working area for the calculation. (For example, a RAM), an electronic board on which electronic components such as an input / output unit (I / F) for inputting signals from sensors, sensors and the like, and outputting the result of calculation to an actuator are mounted. The idling stop-ECU is mainly responsible for engine start control by an idling stop function which will be described later.

  The ENG-ECU 200 also includes a similar electronic board, and is mainly responsible for engine control after engine startup.

The calculation unit 100a of the idling stop-ECU 100 inputs signals from the following switches (A) to (I) and sensors from the input / output unit and stores the input signals and the nonvolatile storage unit 100b. Based on the control program, control values for controlling actuators (L) and (M) described later are calculated.
(A) An ignition switch 11 for turning on or off a main relay for starting or ending an electronic system that electronically controls an actuator for driving the vehicle, that is, for starting or ending the vehicle system (IG-SW).
(B) An accessory switch (ACC-SW) that turns on or off a switch for starting or ending an electronic system that electronically controls vehicle accessories.
(C) A starter switch 12 (ST-SW) for turning on or off a start switch 30 for starting or shutting off the starter system. This starter switch is turned on when the user gets in the driver's seat of the vehicle, inserts the key of the vehicle into a predetermined port, and turns the key to a predetermined position.
(D) A vehicle speed detector 13 (vehicle speed sensor) that detects the vehicle speed of the vehicle.
(E) A temperature detector 14 (temperature sensor) that detects the ambient temperature of the coil 1 and the electromagnet 2 of the starter motor 5. The temperature detection unit may detect the temperature of the coil 1 or the electromagnet 2. That is, since the coil is wound around the electromagnet without contact, the temperature of the electromagnet, the ambient temperature of the coil, and the ambient temperature of the electromagnet can be considered as the coil temperature.
(F) An accelerator detection unit 15 (accelerator sensor) that detects the operation state of the accelerator for the user to accelerate the speed of the vehicle.
(G) The brake detection part 16 (brake sensor) which detects the operation state of the brake for a user to decelerate or stop the speed of a vehicle.
(H) The voltage detection part 41 (voltage sensor) which detects the voltage in the electric current system mentioned later.
(I) The voltage detection part 42 (voltage sensor) which detects the voltage in the electric current system mentioned later.

The calculation unit 100a of the idling stop-ECU 100 is based on the following (L) and (I) based on the signals from the switches and sensors (A) to (I) and the control program stored in the nonvolatile storage unit 100b. The control value for controlling the actuator of M) is calculated, and the calculated control value is output from the input / output unit.
(L) The coil 1 in the starter system described above.
(M) The starter motor 5 in the starter system described above.

The calculation unit a of the engine-ECU 200 inputs signals from the following sensors (J) and (K) through the input / output unit, and enters the input signal and a control program stored in the nonvolatile storage unit 200b. Based on this, control values for controlling actuators (N) to (P) described later are calculated.
(J) A crank angle detection unit 17 (a crank angle sensor) that detects a cylinder to be exploded by a spark plug or an injector when the engine rotational speed is detected or cranking control of the engine is performed.
(K) A cam angle detector 18 (cam angle sensor) that detects a cylinder to be exploded by an ignition plug or an injector when cranking the engine.

The calculation unit 200a of the engine-ECU 200 performs the following (N) to (P) based on the signals from the switches and sensors (J) and (K) and the control program stored in the nonvolatile storage unit 200b. The control value for controlling the actuator up to is calculated, and the calculated control value is output from the input / output unit.
(N) An igniter 19 (ignition plug) for igniting air and fuel entering the cylinder of the engine.
(O) A fuel injection unit 20 (injector) for injecting fuel necessary for the explosion in the cylinder of the engine.
(P) An intake portion 21 (throttle) for sucking in air necessary for explosion to the cylinder of the engine.

  The idling stop-ECU 100 and the engine-ECU 200 input and output signals and computation results input to each other at the input / output unit via the communication unit 10 and the vehicle-mounted network that connect both ECUs.

  As shown in FIG. 6, the engine-ECU 300 receives signals from all the switches and sensors (A) to (K) and controls to control all the actuators (L) to (P). It may be configured to calculate and output a value.

  Since the functions of the idling stop-ECU 100 and the ENG-ECU 200 shown in FIG. 5 can be realized by a single ENG-ECU 100 as shown in FIG. 6, the idling stop-ECU 100 and the ENG-ECU 200 shown in FIG. The engine control device 300 can be considered collectively.

<Engine start control by turning on the start switch>
(Engine start control)
A control for starting the engine when the starter switch 12 is operated by the user and the start switch 30 is turned on will be described.

  When the starter switch 12 is operated by the user and the start switch 30 is turned on, the starter system is controlled by hardware control. That is, electricity is supplied to the coil 1 to control the plunger 3, and after the pinion gear 7 of the starter motor 5 is engaged with the ring gear 8 of the engine, the starter motor 5 is driven and controlled.

  The calculation unit 300a of the engine control device 300 performs cranking control of the engine when the start switch 30 is turned on by the operation of the starter switch 12 by the user. When the cranking control is performed, the arithmetic unit 300a of the engine control device 300 is driven by the starter system because the rotation cannot be controlled only by the engine until the engine speed reaches a predetermined speed (1500 rpm). The starter motor 5 assists the rotation of the engine.

  The engine is a 4-cylinder 4-cycle engine. Based on the input signal from the crank angle detection unit 17, the calculation unit 300 a of the engine control device 300 determines two of the four cylinders whose pistons are at top dead center. Based on the input signal from the cam angle detector 18 among the two discriminated cylinders, the cylinder that performs ignition or fuel injection is discriminated, and a control signal is output to the ignition unit 19 or the fuel injector 20 of the discriminated cylinder for explosion. Let After the cylinder to be exploded is determined, the cylinder to be exploded is determined based on the input signal from the crank angle detection unit 17 and a predetermined order, and the control to explode the determined cylinder is repeated. The engine may be a three-cylinder engine or a six-cylinder engine, and cranking control of these engines is also performed by the arithmetic unit based on input signals from the crank angle detection unit and the cam angle detection unit.

The user inserts the key into a predetermined insertion slot, manually turns the inserted key to the position of the starter switch 12, and the user determines from the engine sound that the engine speed has reached the predetermined speed. Is returned to the ON position of the ignition switch 11. As a result, the start switch 30 is turned from on to off, the current flowing from the power source to the starter system is interrupted, and the starter system is stopped.
(Control circuit)
A control circuit for starting the engine when the start switch 30 is turned on by the user operating the starter switch 12 will be described with reference to FIG.
(Current system A)
The vehicle is provided with a current system A which is a first current system for supplying electricity from a power supply unit 31 which is a first power supply unit provided in the vehicle to the grounding unit 32. In the current system A, a start switch 30 and a coil are provided from the power supply side. 1 is provided.

  When the user operates the starter switch 12, the start switch 30 in the starter system is turned on. When the start switch 30 is turned on, electricity flows from the power supply unit 31 to the ground unit 32 in the current system A of the vehicle.

As a result, electricity flows to the coil 1 to control the plunger 3 described above, and the pinion gear 7 of the starter motor 5 meshes with the ring gear 8 of the engine.
(Current system B)
Next, the vehicle is provided with a current system B which is a second current system that branches from between the start switch 30 and the coil 1 in the current system A and flows electricity to the grounding part 33 through the engine control device 300. ing.

  In the current system B in the engine control apparatus 300, the switch 34 (bipolar transistor) which is a first switch that cuts off or energizes the current flowing from the current system A to the current system B by turning on or off, and the current system A A delay circuit is provided which inputs flowing electricity and delays the input to control the switch 34 to be turned on. In addition, a starter motor 5 is provided between the engine control device 300 and the grounding portion 33 in the current system B in which electricity is supplied to the grounding portion 33 via the engine control device 300.

  With this configuration, when the current flows to the current system A, the electricity branched from the current system A once flows into the engine control device 300, and the delay circuit in the engine control device 300 is connected to the electricity downstream of the switch 34. Can be delayed.

  As a result, the electricity from the current system A is caused to flow to the current system B with a delay, so that the starter motor 5 is brought into mesh with the pinion gear 7 of the starter motor 5 and the ring gear 8 of the engine being stopped. 5 can be driven, and engine start control in which the generation of abnormal noise is suppressed can be realized.

<Engine start control by idling stop function>
A control for starting the engine by the idling stop function will be described.

The idling stop function is an engine control for suppressing fuel consumption. The start switch 30 is turned on by the user operating the starter switch 12 to start the engine, and then the ignition switch 11 is turned off by the user to stop the engine. Until the vehicle is stopped, the engine is stopped when the condition (engine stop condition) such as the vehicle stops is satisfied, and the engine is started when the condition (engine start condition) such as detecting the accelerator operation of the user is satisfied thereafter. Say.
(Engine stop control)
The calculation unit 300a of the engine control device 300 stops the engine by satisfying the following conditions (1) to (6) (engine stop condition).
(1) The calculation unit 300a determines that the vehicle speed is 0 based on the input signal from the vehicle speed detection unit 13.
(2) When the calculation unit 300a determines that the accelerator is not operated based on the input signal from the accelerator detection unit 15.
(3) When the calculation unit 300a determines that the brake is operated based on the input signal from the brake detection unit 16.
(4) When the calculation unit 300a determines that the shift stage is a drive based on an input signal from the shift stage detection unit.
(5) A case where it is determined that the capacity is equal to or greater than a predetermined capacity based on an input signal from a capacity detection unit of a battery as a power source. Note that another control device may make the determination and input the determination result.
(6) When the idle control must not be maintained by other control.

  The conditions for engine start control by the idling stop function are not limited to the above, and various conditions may be added as long as they meet the purpose of the idling stop function, and any of the above conditions is deleted. It may be.

The arithmetic unit 300a stops the engine by satisfying the above conditions. The engine stop control by the idling stop function is realized by stopping the control of the ignition unit 19, the fuel injection unit 20, and the intake unit 21 and setting the engine speed to zero.
(Engine start control)
The engine unit 300a of the engine control device 300 starts the engine when the following conditions (7) to (9) (engine start conditions) are satisfied.
(7) When the arithmetic unit 300a determines that the accelerator operation has been performed from the idling stop state based on the input signal from the accelerator detection unit 15.
(8) When the calculation unit 300a determines that the brake is not operated based on the input signal from the brake detection unit 16.
(9) When the calculation unit 300a determines that the shift stage is a drive based on an input signal from the shift stage detection unit.

  The conditions for engine start control by the idling stop function are not limited to the above, and various conditions may be added as long as they meet the purpose of the idling stop function, and any of the above conditions is deleted. It may be.

When the arithmetic unit 300a of the engine control device 300 drives the starter motor 5 in cooperation with the control circuit and determines that the engine speed has reached a predetermined speed based on the input signal from the crank angle detection unit 17. Since the rotation assistance of the starter motor 5 is unnecessary, the drive of the starter motor 5 is stopped.
(Control circuit)
(Current system C)
A control circuit for starting the engine by the idling stop function will be described with reference to FIG.

  An arithmetic unit 300a provided in the engine control device 300 cooperates with a control circuit to be described next to start the engine based on the idling stop function described above.

  The vehicle is connected to the upstream side of the delay circuit 35 and the switch 34 in the current system B provided in the engine control apparatus 300 from the power supply section 38 which is the second power supply section provided in the engine control apparatus 300, and the current system downstream of this connection section. A current system C which is a third current system for supplying electricity from B to the grounding section 32 is provided. In the current system C, the power supply unit 38 side is provided in the engine control device 300, and the grounding unit 32 side is provided in the vehicle. A starter motor 5 is provided on the ground side of the current system C. That is, the current system C on the grounding portion 32 side provided in the vehicle is used in combination with the current system A and the current system B.

  In addition, the current system C on the power supply unit 38 side of the engine control device 300 includes a switch 39 that is a second switch that energizes or cuts off the electricity flowing from the power supply unit 38 to the ground unit 32 by turning on or off. ing. Furthermore, a diode 36 is provided between the switch 34 in the current system C and the connection portion thereof so as not to reversely flow electricity to the power supply unit 38.

  The arithmetic unit 300a of the engine control device 300 turns on or off the switch 39 to energize or cut off the electricity from the power source unit 38 to the ground unit 32 and to control the flow of electricity to the coil 1 in the current system C. Can do.

  The delay circuit 35 that delays the flow of electricity in the current system B takes in a signal line branched from between the switch 39 and the diode 36 in the current system C and a signal line branched downstream from the diode 36 in the current system C, and starts. Whether the switch 30 is turned on and electricity flows to the current system B, or the arithmetic unit 300a turns on the switch 39 to monitor whether electricity flows to the current system B. The delay circuit 35 can determine which of the electricity is flowing by the action of the logic circuit based on the signal from the pulled-in monitor line, and the start switch 30 is turned on and the electricity flows to the current system B. In the case where it is determined that the current has flown to the current system B upstream of the switch 34, the switch 34 is turned on, the power is supplied to the grounding unit 33, and the starter motor 5 is driven. When it is determined that electricity has flowed to the current system B with the switch 39 turned on, the switch 34 is not turned on and the off state is maintained.

  That is, only when the starter switch 12 is operated by the user and the start switch 30 is turned on, the delay circuit 35 supplies the electricity to the coil 1, and supplies the electricity to the coil 1 and then delays it to drive the starter motor 5. In other words, even when electricity is supplied to the delay circuit 35 when the arithmetic unit 300a supplies electricity to the coil 1 by the idling stop function, the switch 34 is turned on by the delay circuit 35 in order to start the engine by the arithmetic unit 300a. There is no control.

  Accordingly, the diode X that prevents the electricity flowing through the current system C from flowing into the current system B and flowing into the delay circuit 35 is not provided.

  Details of such a logical configuration of the delay circuit will be described later.

The arithmetic unit 300a included in the engine control device 300 performs engine start control in cooperation with such a control circuit. When the calculation unit 300a determines that the engine start condition in the idling stop function is satisfied, the starter starts after the time corresponding to the temperature has elapsed (delayed) after electricity is supplied to the coil 1 based on the input value from the temperature detection unit. A time corresponding to the temperature at which the motor is driven is calculated. For example, this calculation refers to a temperature and delay time map stored in the nonvolatile storage unit 300b. The arithmetic unit 300a turns on the switch 40 after the time corresponding to the temperature has elapsed since the switch 39 was turned on.
(Current system D)
The engine control device 300 is connected to a power supply unit 38 provided in the engine control device 300 downstream from the switch 34 provided in the current system B in the engine control device 300, and a fourth current system for supplying electricity to the grounding unit 33 of the vehicle. A current system D is provided. That is, the current system D on the grounding portion 33 side provided in the vehicle is used in combination with the current system B.

  Further, the current system D includes a switch 40 that is a third switch that energizes or interrupts electricity flowing from the power supply unit 38 to the ground unit 33 by being turned on or off. Further, a diode 37 is provided between the switch 40 in the current system D and the connection portion thereof so as not to reversely flow electricity to the power supply unit 38.

  The arithmetic unit 300a of the engine control device 300 turns on or off the switch 40, thereby energizing or interrupting the electricity from the power source unit 32 to the ground unit 33, and controls the flow of electricity to the starter motor 5 in the current system D. be able to.

  If the switch 34 is a bipolar transistor, the diode Y that prevents the current flowing through the current system D from flowing into the current system B and flowing into the delay circuit 35 is not provided. This is because the reverse flow of electricity does not occur when the switch 34 is changed from a MOS transistor to a bipolar transistor.

  If the switch 34 is a MOS transistor, electricity will flow backward unless a diode for preventing backflow is provided in the vicinity thereof. However, since the delay circuit 35 has the above-described function, electricity flows around and is input to the delay circuit. Even if this is the case, the switch 34 will not malfunction.

  As shown in FIG. 6, the current system A and the current system C flow electricity from the power supply unit 31 and the power supply unit 38 upstream of each current system to the same grounding unit 32. The current system C joins downstream of the switch 39 and the combined downstream current system is used in combination.

  As shown in FIG. 6, the current system B and the current system D flow electricity from the power supply unit 31 and the power supply unit 38 upstream of each current system to the same grounding unit 33. The downstream of the switch 40 provided in the system D is merged, and the merged downstream current system is used in combination.

In addition, the main source of each power supply unit is a battery provided in the vehicle.
(Preventing starter motor malfunction and ensuring minimum operating voltage)
Here, normally, when two or more current systems are connected, the diode X and the diode Y so that electricity flowing in one current system does not flow into the other current system and can flow electricity in a desired direction. It is necessary to provide.

  However, since the diode becomes a resistance even when electricity flows in a desired direction in the current system, it is necessary to apply electricity by applying a larger voltage than when no diode is provided. Therefore, when the storage capacity of the battery, which is the source of each power supply unit, is low, or when the temperature is low and the discharge capacity of the battery is low, it operates when no diode is provided. There arises a problem that the starter system becomes inoperable due to the provision of the diode. That is, the minimum operating voltage becomes high.

  If the diode X and the diode Y are not provided in order to solve this problem, when the arithmetic unit a executes engine start control by the idling stop function, electricity flows into the delay circuit, causing the delay circuit to malfunction. This causes the problem of operating the starter motor.

  Therefore, the above-described delay circuit is provided so as to ensure a minimum operating voltage when starting the engine and to prevent such malfunction.

Since the delay circuit 35 having such a function is employed, it is possible to reduce the manufacturing cost by omitting the diode X and the diode Y, and to lower the minimum operating voltage when starting the engine. .
(Delay circuit)
Details of the delay circuit 35 having the above-described function will be described with reference to FIG.

  In order to detect whether or not electricity has flowed upstream of the switch 34 in the current system B provided in the engine control device 300, a resistor T1 is provided at that position, and two connection lines connecting both ends of the resistor T1 are provided. Connect to the comparison circuit CP1. The two connecting lines are provided with resistors T2 and T3, respectively, and the current value is suppressed so as to be an appropriate value when the current is compared in the comparator CP1. One of the two connection lines is connected to the minus part of the comparator CP1. One connection line is further connected to one end of a power supply D2 having a comparison voltage value with the other end grounded. Further, one end thereof is extended and connected to the knot circuit NT3, and the knot circuit NT3 is connected to the reset unit of the flip-flop circuit FF. The comparator CP1 is connected to the chopping circuit CHP.

  That is, when electricity flows to the current system B, the control signal HI flows through one connection line, the control signal HI is converted into the control signal LOW in the knot circuit NT3, and the control signal LOW is converted into the reset unit of the flip-flop circuit FF. Is input. Conversely, when electricity does not flow to the current system B, the control signal HI is input to the reset unit.

  In the comparator CP1, the other connection line of the two connection lines is connected to the plus portion. Comparator CP1 uses the current input from one connection line as a reference voltage, and compares the current in the other connection line with the reference voltage. The comparator CP1 outputs a control signal HI to the chopping circuit CHP when the voltage input to the plus part exceeds the reference voltage input to the minus part. The chopping circuit CHP is connected to the knot circuit NT1.

  Therefore, this action assumes that electricity flows in the current system B when the voltage in the current system B exceeds the reference voltage, and is responsible for the function of controlling the starter motor 5.

  The chopping circuit CHP chops the control signal HI at a predetermined cycle and outputs it. This is to prevent thermal destruction of the switch 34 due to overcurrent when the load is short-circuited.

  Of the two connection lines, the connection line branched from the connection line input to the minus part of the comparator CP1 is connected to the plus part of the comparator CP2. One end of a power source D1 having a comparison voltage value with the other end grounded is connected to the minus part of the comparator CP2.

  The branched connection line is provided with a resistor T4 for suppressing the current to an appropriate value, and one end of a capacitor CD whose other end is grounded is connected downstream thereof. That is, when electricity flows to the current system B, electricity flows to the branched connection line, is suppressed by the resistor T4, and is accumulated in the capacitor CD. When electricity is accumulated and exceeds the accumulation capacity of the capacitor CD, electricity flows out to the comparator CP2.

  The comparator CP2 compares the electric voltage input to the plus part with the reference voltage input to the minus part. The comparator CP2 is connected to the flip-flop circuit FF, and the comparator CP2 outputs a control signal HI to the flip-flop circuit FF when the electric voltage flowing out exceeds the reference voltage.

  Therefore, it can be said that this action plays a role of a function of delaying the flow of electricity in the current system B.

  As described above, since the flip-flop circuit FF is not reset when electricity flows through the current system B, the control signal HI input from the comparator CP2 is inverted and the control signal LOW is connected to the flip-flop circuit FF. Output to the NOR circuit NR1.

  The NOR circuit NR1 is connected with a control line for the arithmetic unit 300a to control the switch 39, that is, a control line branched from the control line connecting the arithmetic unit 300a and the switch 39. When the starter switch 12 is operated and the start switch 30 is turned on to execute the engine start control, in other words, when the engine start control is not executed by the arithmetic unit 300a by the idling stop function, the control signal is sent to the NOR circuit NR1. LOW is input. Conversely, when the starter switch 12 is operated and the start switch 30 is turned on and the engine start control is not executed, in other words, when the engine start control is executed by the arithmetic unit 300a by the idling stop function, the NOR circuit NR1 is entered. Is supplied with a control signal HI.

  That is, the NOR circuit NR1 operates when the electricity flows into the current system B and when the arithmetic unit 300a does not output the control signal HI, in other words, the starter switch 12 is operated to turn on the start switch 30 and the engine The control signal HI is output when the start control is executed and when the engine start control is not executed by the arithmetic unit 300a by the idling stop function.

  Further, the NOR circuit NR1 operates when the electricity flows to the current system B and when the arithmetic unit 300a outputs the control signal HI, in other words, the start switch 30 is turned on by operating the starter switch 12 by the user. The control signal LOW is output when the engine start control is not executed and when the engine start control is executed by the arithmetic unit 300a by the idling stop function.

  Therefore, this function is a function for determining when the starter switch 12 is operated by the user and the start switch 30 is turned on to execute the engine start control, and when the engine start control is executed by the arithmetic unit 300a by the idling stop function. Plays the role of

  The NOR circuit NR1 is connected to the NOT circuit NT2, and the NOT circuit NT2 is connected to the NOR circuit NR2. The NOR circuit NR2 is connected to the buffer circuit B1, and the buffer circuit B1 is connected to the switch 34. When the NOR circuit NR1 outputs the control signal HI, the signal is inverted in the NOT circuit NT2, and the control signal LOW is output to the NOR circuit NR2. On the contrary, when the NOR circuit NR1 outputs the control signal LOW, the signal is inverted in the NOT circuit NT2, and the control signal HI is output to the NOR circuit NR2.

  The NOR circuit NR2 outputs the control signal HI to the buffer circuit B1 and controls the switch 34 to ON only when the control signal LOW is input from the knot circuit NT1 and the control signal LOW is input from the knot circuit NT2.

  That is, the NOR circuit NR2 is a case where the start switch 30 is turned on by the user operating the starter switch 12 and the engine start control is executed, and the engine start control is not executed by the arithmetic unit 300a by the idling stop function. Further, only when the chopping circuit CHP chops the control signal HI, the control signal HI is output to the buffer circuit B1 and the switch 34 is controlled to be turned on to drive the starter motor 5.

  By adopting such a configuration, the following effects can be obtained.

  The generation of noise during engine start control can be suppressed by hardware control and software control for driving the starter motor 5 after the coil 1 is energized.

  When the user operates the starter switch 12, the starter system is controlled by hardware control having a failure rate lower than that of software control. Therefore, a start failure when the user operates the starter switch 12 can be prevented.

  When the start switch is turned on by the user operating the starter switch 12 and the engine is controlled to start, the engine is started based on hardware control. When the engine is controlled to start using the idling stop function, the engine is started based on software control. Therefore, the startability of the engine in the case of engine start control by the idling stop function can be accelerated and the reliability of engine start can be improved.

When the engine is started by hardware control, the delay circuit 35 exhibits the current delay function. When the engine is started by software control, the delay circuit 35 cuts off the current. The minimum operating voltage can be ensured low, and the manufacturing cost can be reduced by omitting the provision of diode parts.
<Fail safe control during engine start control by turning on the start switch>
When the start switch 30 is turned on by the user's operation of the starter switch 12 and the engine is controlled to start, if the switch 34 becomes off-fixed abnormally, the drive lever 4 of the starter system is operated to connect the pinion gear 7 to the ring gear 8. However, the starter motor 5 cannot be driven.

  The off-fixing abnormality of the switch 34 means that the switch 34 is not turned on even when electricity for controlling the switch 34 to be turned on by the delay circuit 35 is supplied.

  As mentioned above, engine start-up failure is one of the most detrimental product values compared to other functional failures. Therefore, the engine start control is realized by hardware control with a low failure rate to prevent the start-up failure. It is out. However, there is a risk of failure even with hardware, and in particular, an electronic component such as the switch 34 that dynamically controls the flow of electricity tends to have a higher failure rate than other electronic components.

  Therefore, fail safe control when the switch 34 fails, especially when an off-fixation abnormality occurs, is executed by the arithmetic unit 300a of the engine control device 300 to prevent engine start failure. This fail safe control will be described with reference to FIG.

  When the ignition switch 11 is turned on by the user, the control shown in FIG. 5 is started. When the ignition switch 11 is turned on, the electronic control device including the engine control device provided in the vehicle is turned on and activated (STEP 1).

  Next, the calculation unit 300a is a first detection unit that detects a voltage value upstream of the switch 34 when the start switch 30 is turned on and electricity flows from the power supply unit 31 to the coil 1 in the current system A. A first voltage value is calculated based on a signal from a certain detection unit 41 (STEP 2). The detection unit 41 has one end grounded to the grounding unit and the other end connected downstream of the diode 36 of the current system C.

  In addition, as long as it is a location which can detect the voltage value upstream from the switch 34 when electricity flows into the current system A and the current system B, the current system B or the current system C may be provided.

  Next, the calculation unit 300a is a second detection unit that detects a voltage value downstream of the switch 34 when the start switch 30 is turned on and electricity flows from the power supply unit 31 to the coil 1 in the current system A. A second voltage value is calculated based on a signal from a certain detection unit 42 (STEP 3). The detection unit 42 has one end grounded to the grounding unit and the other end connected downstream of the diode 37 of the current system D.

  In addition, as long as it is a location which can detect the voltage value downstream from the switch 34 when electricity flows into the current system A and the current system B, the current system B or the current system D may be provided.

  Next, when the value obtained by subtracting the second voltage value from the calculated first voltage value is equal to or greater than a predetermined value, the arithmetic unit 300a does not flow electricity downstream from the switch 34. That is, it is determined that the switch 34 is temporarily off-fixed abnormality (off-fixed temporary abnormality), and the process proceeds to STEP 5 (YES in STEP 4). On the other hand, when the subtracted value is less than the predetermined value, electricity flows downstream from the switch 34. That is, it is determined that the switch 34 is not off-fixed abnormality, and the routine proceeds to return (NO in STEP 4). If it is determined that the switch 34 is not off abnormally and the process returns to the return, the fail-safe control shown in FIG. 5 is repeated for a predetermined time.

  When the arithmetic unit 300a determines that the switch 34 is temporarily stuck off, the switch 34 is turned on (STEP 5).

  Next, the calculating part 300a calculates a 1st voltage value based on the signal from the detection part 41 (STEP6).

  Next, the calculating part 300a calculates a 2nd voltage value based on the signal from the detection part 42 (STEP7).

  Next, when the value obtained by subtracting the second voltage value from the calculated first voltage value is equal to or greater than a predetermined value, the arithmetic unit 300a determines that the switch 34 is off-fixed abnormality (off-fixed main abnormality), and proceeds to STEP9. Transition (YES in STEP 8). On the other hand, if the subtracted value is less than the predetermined value, it is determined that the switch 34 is not off-fixed abnormality, and the routine proceeds to return (NO in STEP 8). When it is determined that the switch 34 is not off abnormally and the process returns to the return, the fail-safe control shown in FIG. 5 is repeated for a predetermined time.

  When the calculation unit 300a determines that the switch 34 is in the off-fixed main abnormality, the calculation unit 300a calculates the coil temperature based on a signal from the temperature detection unit 14 that detects the coil temperature (STEP 9).

  Next, the arithmetic unit 300a determines a time (delay time) corresponding to the temperature based on the calculated temperature and the temperature of the coil stored in the nonvolatile storage unit 300b and a delay time map corresponding to the temperature. (STEP 10).

  Next, the arithmetic unit 300a controls the switch 40 to be on based on a time (delay time) corresponding to the determined temperature (STEP 11). That is, the switch 40 is turned on after a time corresponding to the temperature has elapsed since the signal from the detection unit 41 was received, and electricity from the power supply unit 38 is supplied to the ground unit 33 to drive the starter motor 5.

  When fail-safe control is executed, the arithmetic unit 300a ends without repeating the control shown in FIG. 5 for a predetermined time.

By executing such fail-safe control, it is possible to prevent the occurrence of engine start failure, which is one of the ones that reduce the commercial value most.
<Fail-safe control during engine start control with idling stop function>
When the start control of the engine is controlled by the idling stop function, if the switch 40 becomes off-fixed abnormally, the drive lever 4 of the starter system can be operated to engage the pinion gear 7 with the ring gear 8, but the starter motor 5 It cannot be driven.

  Even engine start control by idling stop does not change to engine start control, so we want to prevent engine start failure as much as possible.

  Therefore, fail-safe control when the switch 40 fails, especially when an off-fixation abnormality occurs, is executed by the arithmetic unit 300a of the engine control device 300 to prevent engine start failure. This fail safe control will be described with reference to FIG.

When the engine is controlled to start by the idling stop function, the control shown in FIG. 7 is started.
First, the arithmetic unit 300a controls the switch 39 to be on (STEP 21).

  Next, the arithmetic unit 300a controls the switch 40 to be turned on (STEP 22).

  Next, the arithmetic unit 300a controls the switch 39 to be turned on to detect a voltage value downstream from the switch 39 when electricity flows from the power source unit 38 to the coil 1 in the current system C. A first voltage value is calculated based on the signal (STEP 23). The detection unit 41 has one end grounded to the ground unit and the other end connected downstream of the switch 39 of the current system C.

  It should be noted that the current system B or the current system C may be provided as long as a voltage value downstream from the switch 40 when electricity flows through the current system C can be detected.

  Next, the arithmetic unit 300a turns on the switch 40 and a signal from the detection unit 42 that detects a voltage value downstream of the switch 40 when electricity flows from the power source unit 38 to the starter motor 5 in the current system D. The second voltage value is calculated based on (STEP 24). The detection unit 42 has one end grounded to the grounding unit and the other end connected downstream of the diode 37 of the current system D.

  Note that the current system B or the current system D may be provided as long as a voltage value downstream of the switch 40 when electricity flows through the current system D can be detected.

  Next, when the value obtained by subtracting the second voltage value from the calculated first voltage value is equal to or greater than a predetermined value, the arithmetic unit 300a does not flow electricity downstream of the switch 40. That is, it is determined that the switch 40 has a temporary off-fixing abnormality (off-fixing temporary abnormality), and the process proceeds to STEP 26 (YES in STEP 25). On the other hand, when the subtracted value is less than the predetermined value, electricity flows downstream from the switch 40. That is, it is determined that the switch 40 is not off-fixed abnormality, and the routine proceeds to return (NO in STEP 25). If it is determined that the switch 40 is not off-fixed and the process returns to the return, the fail-safe control shown in FIG. 5 is repeated for a predetermined time.

  When the arithmetic unit 300a determines that the switch 34 is temporarily off, the switch 40, which is the third switch, is controlled to be turned on (STEP 26).

  Next, the calculating part 300a calculates a 1st voltage value based on the signal from the detection part 41 (STEP27).

  Next, the calculating part 300a calculates a 2nd voltage value based on the signal from the detection part 42 (STEP28).

  Next, when the value obtained by subtracting the second voltage value from the calculated first voltage value is equal to or greater than a predetermined value, the arithmetic unit 300a determines that the switch 40 is off-fixed abnormality (off-fixed main abnormality) and proceeds to STEP 30. Transition (YES in STEP 29). On the other hand, if the subtracted value is less than the predetermined value, it is determined that the switch 34 is not off-fixed abnormality, and the routine proceeds to return (NO in STEP 29). If it is determined that the switch 40 is not off-fixed and the process returns to the return, the fail-safe control shown in FIG. 5 is repeated for a predetermined time.

  When the calculation unit 300a determines that the switch 40 is in the off-fixed main abnormality, the temperature of the coil 1 is calculated based on a signal from the temperature detection unit 14 that detects the temperature of the coil 1 (STEP 30).

  Next, the arithmetic unit 300a determines a time (delay time) according to the temperature based on the calculated temperature, a temperature stored in the nonvolatile storage unit 300b, and a delay time map (STEP 31).

  Next, the arithmetic unit 300a controls the switch 39 and the switch 34 to be on based on a time (delay time) corresponding to the determined temperature (STEP 32). That is, after the switch 39 is turned on, the switch 39 and the switch 34 are turned on after a lapse of time corresponding to the temperature, and the starter motor 5 is driven by supplying electricity from the power supply unit 38 to the ground unit 33.

  When fail-safe control is executed, the arithmetic unit 300a ends without repeating the control shown in FIG. 5 for a predetermined time.

  By executing such fail-safe control, it is possible to prevent the occurrence of engine start failure, which is one of the ones that reduce the commercial value most.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are possible.

DESCRIPTION OF SYMBOLS 1 Coil 2 Electromagnet 5 Starter motor 7 Pinion gear 8 Ring gear 11 Ignition switch 12 Starter switch 14 Temperature detection part 30 Start switch 35 Delay circuit 300 Engine control apparatus

Claims (9)

An engine control device that controls start of a vehicle engine by introducing current from a power source to a starter motor and a coil that changes a connection state of the output shaft of the starter motor to the engine,
A current branched from a first current system for guiding current from the power source to the coil and interposed in a second current system for guiding current to the starter motor, and led from the first current system to the starter motor by turning on or off. A first switch for energizing or shutting off,
A delay circuit for controlling the first switch to delay the current from being guided to the coil and guiding the current to the starter motor;
A second switch that is interposed in a third current system that conducts current from the power source to the coil, and that turns on or off the current that is conducted from the power source to the coil;
A third switch that is interposed in a fourth current system that guides a current from the power source to the starter motor, and that energizes or interrupts the current from the power source to the starter motor;
Control means for controlling the second switch and the third switch to execute engine start control;
First detection means for detecting a voltage on the power source side from a first switch interposed in the second current system;
Second detection means for detecting a voltage on the starter motor side from a first switch interposed in the second current system;
With
The control means is based on a voltage detected by the first detection means and a voltage detected by the second detection means when a start switch interposed in the first current system is turned on by a user operation. Then, when an off-fixing abnormality of the first switch is detected, the engine is controlled to start by controlling the third switch. The engine control device according to claim 1,
A temperature detecting means for detecting the temperature of the coil;
The control means turns on the second switch and turns on the third switch after a time corresponding to the temperature has elapsed after turning on the second switch and sending current to the coil. Engine control device. In the engine control device according to claim 1 or 2,
The control means, when the start switch is turned on by a user operation, when the voltage difference between the voltage detected by the first detection means and the voltage detected by the second detection means is a predetermined value or more, Instructing to turn on the first switch, and if the voltage difference at that time is greater than or equal to a predetermined value, the engine is controlled to start by controlling the second switch and the third switch. apparatus. The engine control device according to any one of claims 1 to 3,
The control means instructs the third switch to turn on, and turns on the first switch and the second switch when the voltage detected by the second detection means is equal to or lower than a predetermined voltage. An engine control device characterized in that electricity from the third current system is led to the second current system. The engine control apparatus according to claim 4, wherein
When the start switch is turned on by a user operation, the delay circuit controls the first switch to introduce a current to the coil and then delay the current to the starter motor. When the second switch is turned on, the first switch is turned off to interrupt a current guided to the starter motor. Engine,
A starter motor for starting the engine;
A coil for changing a connection state of the output shaft of the starter motor to the engine;
The engine control device according to any one of claims 1 to 5, wherein the start of the engine is controlled by introducing a current from a power source to the starter motor and the coil.
A vehicle comprising: An engine control method for controlling start of a vehicle engine by introducing current from a power source to a starter motor and a coil that changes a connection state of the output shaft of the starter motor to the engine,
The vehicle is interposed in a second current system that branches from a first current system that leads from the power source to the coil and that conducts current to the starter motor. By turning on or off, the vehicle changes from the first current system to the starter motor. A first switch for energizing or interrupting a current to be guided; a delay circuit for controlling the first switch to delay the current after being guided to the coil and guiding the current to the starter motor; and a current from the power source to the coil A second switch that is connected to a third current system that guides current from the power source to the coil by turning on or off, and a fourth current system that guides current from the power source to the starter motor A third switch that is turned on or off to pass or cut off current from the power source to the starter motor, and the second switch. Control means for controlling the engine and the third switch to execute engine start control, and first detection means for detecting the voltage on the power source side from the first switch, which is interposed in the second current system, And a second detection means for detecting a voltage on the starter motor side from a first switch interposed in the second current system,
In the vehicle, the voltage detected by the first detection means and the second voltage when the start switch interposed in the first current system is turned on by user operation and electricity flows to the second current system. Detecting off-fixation abnormality of the first switch based on the voltage detected by the detecting means;
An engine control method comprising a step of controlling the start of the engine by controlling the third switch when detecting an off-fixation abnormality of the first switch. An engine control device that controls start of a vehicle engine by introducing current from a power source to a starter motor and a coil that changes a connection state of the output shaft of the starter motor to the engine,
When the intervening start switch is turned on or off, it is inserted into a second current system that branches from the first current system that conducts current from the power source to the coil and that conducts current to the starter motor, and is turned on or off. A first switch for energizing or interrupting the current led from the first current system to the starter motor,
A delay circuit for controlling the first switch to delay the current from being guided to the coil and guiding the current to the starter motor;
A second switch that is interposed in a third current system that conducts current from the power source to the coil, and that turns on or off the current that is conducted from the power source to the coil;
A third switch that is interposed in a fourth current system that guides a current from the power source to the starter motor, and that energizes or interrupts the current from the power source to the starter motor;
Control means for controlling the second switch and the third switch to execute engine start control;
Detecting means for detecting a voltage on the starter motor side from a third switch interposed in the second current system;
With
The control means instructs the third switch to turn on, and turns on the first switch and the second switch when the voltage detected by the detection means at that time is equal to or lower than a predetermined voltage. Engine control device. An engine control device that controls start of a vehicle engine by introducing current from a power source to a starter motor and a coil that changes a connection state of the output shaft of the starter motor to the engine,
A current branched from a first current system for guiding current from the power source to the coil and interposed in a second current system for guiding current to the starter motor, and led from the first current system to the starter motor by turning on or off. A first switch for energizing or shutting off,
A delay circuit for controlling the first switch to delay the current from being guided to the coil and guiding the current to the starter motor;
A second switch that is interposed in a third current system that conducts current from the power source to the coil, and that turns on or off the current that is conducted from the power source to the coil;
A third switch that is interposed in a fourth current system that guides a current from the power source to the starter motor, and that energizes or interrupts the current from the power source to the starter motor;
Control means for controlling the second switch and the third switch to execute engine start control;
First detection means for detecting a voltage on the power source side from a first switch interposed in the second current system;
Second detection means for detecting a voltage on the starter motor side from a first switch interposed in the second current system;
With
The control means is configured to detect a difference between a voltage detected by the first detection means and a voltage detected by the second detection means when a start switch interposed in the first current system is turned on by a user operation. An engine control device characterized in that when the value is equal to or greater than a predetermined value, the engine is controlled to start by controlling the third switch.

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